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5.7 hemi milage


This is a discussion on 5.7 hemi milage within the Heavy Duty forums, part of the 4th Gen : 2009 - Present category!
I drive 67 - 70 on the highway and do a bit better. Your mileage sounds about right for driving ...


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Old 01-08-2017, 06:44 PM   #11 (permalink)
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I drive 67 - 70 on the highway and do a bit better. Your mileage sounds about right for driving that speed.


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Old 01-08-2017, 07:22 PM   #12 (permalink)
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I lose 1 mpg for every 5 mph over 65. It's a big brick, and it takes a lot of energy to push it through the air.


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Old 01-09-2017, 08:36 PM   #13 (permalink)
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Thanks much for the replies. I was incorrect in the rpm. It's closer to 2000. I did get a little better coming home from my trip over the weekend but still only about 11.5. Again this seems normal so I'll just deal with it. Just was concerned something was wrong but it seems ok. Thanks all. Hoping I can enjoy this truck.
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Old 01-09-2017, 11:15 PM   #14 (permalink)
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Originally Posted by hextall View Post
Thanks much for the replies. I was incorrect in the rpm. It's closer to 2000. I did get a little better coming home from my trip over the weekend but still only about 11.5. Again this seems normal so I'll just deal with it. Just was concerned something was wrong but it seems ok. Thanks all. Hoping I can enjoy this truck.
thats about exactly what i average 11.3 to 12
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Old 01-10-2017, 02:09 AM   #15 (permalink)
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What I've learned about HD MPG's so far:

62mph is the magic speed.

A Magnaflo muffler will get you +1-2 mpgs. K&N filter maybe something, CAI maybe +1.

Drive like grandma.

MPG's is worse the first 10,000 miles. It seems to get better at 500 and then at 3-4000, and then at 8-10,000. (I always wondered if the computer has a break in protocol?)

Bigger tires or a leveling kit or hauling stuff makes it go down.

No wind, 10,000+ miles, freeway with cruise at 62mph, unloaded, no traffic, flat land, 89 oct good gas, should get 16+ mpg.


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Old 01-10-2017, 10:04 AM   #16 (permalink)
 
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Originally Posted by MN-Ram View Post
Do you have a tonneau cover or topper on your truck yet? They usually help a little. Also, slowing down to 67-70mph will help. I've my truck seems to have a fuel leak above 70mph (j/k). But my mileage is a lot better under 70mph. That goes for my current 6.4L Hemi as well as my 1500 with the 5.7L Hemi.

I've never tuned a gasser, but the problem with the tuner on my old Cummins was that it was way too fun to drive. I was never light on the throttle, so I actually saw lower MPG's after the tune.

If you just got the truck, and live in a cold climate, wait for the summer gas blends. You will see a little better mileage then.
Yea my 6.4 took a major nose dive when the winter blend came out. Went from about 16-17mpg to 9-10mpg.
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Old 01-10-2017, 04:13 PM   #17 (permalink)
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Originally Posted by 68PowerWagon View Post
Yea my 6.4 took a major nose dive when the winter blend came out. Went from about 16-17mpg to 9-10mpg.


Mine does too. Make lots of sense. We want to reduce emissions, so we'll make them burn 30% more fuel.


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Old 01-12-2017, 09:59 AM   #18 (permalink)
 
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I had a 2013 ram 2500 4x4 with the 5.7. Around town I got about 12-13 mpg, but on the hi way it was much better. With 25,000 miles on the truck we went from Illinois to Arizona unloaded and drove between 65 and 75 mph for the whole trip. We consistently got 18-19 mpg on 87 octane.

We bought a new fifth wheel and traded for a 2016 6.4 4x4.....what a disappointment in mpg compared to the 5.7......if I get 15 hi way I'm surprised. Ugh.


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Old 01-12-2017, 10:09 AM   #19 (permalink)
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Originally Posted by NewBlackDak View Post
Mine does too. Make lots of sense. We want to reduce emissions, so we'll make them burn 30% more fuel.


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Old 01-12-2017, 12:37 PM   #20 (permalink)
 
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For gasoline, it is summer blend fuels that have additives to help the environment by lowering its RVP making it less volatile at higher temperatures, not winter. Summer fuel has about a 2% higher energy content due to these additives which is one of the many reasons why you get better fuel mileage in the summer. Winter fuel does not have these additives so it has a higher RVP which increases it's volatility so it can be easily burned in colder temperatures. You would have a lot harder time starting a vehicle with summer fuel on a very cold day than you would with winter fuel. It would also run rough.

There are other things that decrease your mileage during the winter as well like lower tire pressure and the air being more dense. For every 10 F the outside air drops, your tire psi will drop about 1 psi. So if it was 35 psi at 100 F, then it is 25 psi at 0 F. Colder air is also more dense than warm air which means you have to apply more load on your engine in order to push through it. The research we did at Cummins showed a 2% increase in aerodynamic drag for every 10 F decrease in temp.

Also, for gasoline engines, colder more dense air will cause the engine to burn more fuel to stay at the optimum 14.7:1 stoichiometric air/fuel ratio. Basically 14.7 air to 1 fuel. Gasoline engines have to stay around this ratio at all times in order to run correctly and not damage the engine. Since colder air is more dense, there is more of it in a given space. Therefore the engine reads this from the MAF sensor and adds more fuel to compensate for that increased air density. If it didn't add more fuel then it will run lean which damages gasoline engines.

This is why intakes generally hurt fuel economy on newer gasoline engines since the MAF sensor will tell the ECM to add more fuel for any extra air added. This is not the case for diesels since they run lean just about all the time so intakes generally make them more efficient. Under load diesels run about 16:1 and at around 140:1 at idle.
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